A word from Omar, the 'Fly' costume creator:

It's Dr. ManEz Ensekt who became the human fly and had his genes scrambled by his telepod. Now his head is on a fly and his human body has a fly head and arm. Inevitably, he has to live with this condition.

The head has real human hair sewed into it. The eyes and nose flash a sickly green in the dark. The large fly on my shoulder has my real life face and my hair sewed and glued to it.